摘要
风载荷是影响射电望远镜观测性能的重要因素之一,准确获取台址风场特性对风扰下望远镜观测性能的提升至关重要。平均风剖面指数(α)表征了平均风速随垂直高度的变化规律,是台址风场特性表征的重要参数之一。研究面向新疆奇台110 m口径全向可动射电望远镜(QTT)台址风场,利用台址梯度风塔数据,对比了4种α计算方法,最终采用对数替换的方法精细计算各样本区间的α,得到了QTT台址16个标准风向下的α参考值。与规范中B类地面粗糙度α值0.15比较,在[0,2.00)、[2.00,4.00)和[4.00,6.00)m/s风速,精细计算得到的参考值精度分别提升了26.65%、15.76%和11.58%。基于α对台址风场特性分析表明,α随风速的变化与台址地形、来风频率之间存在较强的相关性。
Wind load is an important factor that affects the observation performance of radio telescopes.Along with the increase of the telescope aperture,the wind load acting on the observed performance of the telescope appears more obviously.Therefore,it is important for obtaining the wind field characteristics accurately,which would improve the observation performance of the telescope under the wind disturbance.The average wind profile index(α)shows the varying relation between the average wind speed and the vertical height,which is one of the important parameters of the wind field character at a telescope site.This work focuses on the wind field of 110 m aperture Qitai radio telescope(QTT),located in Xinjiang.With the gradient wind tower data of the QTT site,we use the logarithmic replacement way to compute the value ofαfor the selected data after comparing four calculation methods.The values ofαare deduced in condition of 16 standard wind directions.Compared with the standard value ofαof class B of the ground roughness(α=0.15),the reference values in our exact evaluation are improved to be 26.65%,15.76%and 11.58%in the range of the wind speed of[0,2.00),[2.00,4.00)and[4.00,6.00)m/s,respectively.Based on the analysis of the wind field characteristics of the QTT site,we suggest that the value ofαchanging with the wind speed is strongly related to the topography of the telescope site and the frequency of incoming wind.
作者
扶翼武
何飞龙
许谦
潘元月
李来兵
张世交
FU Yiwu;HE Feilong;XU Qian;PAN Yuanyue;LI Laibing;ZHANG Shijiao(Provincial Key Laboratory of“Stars and Interstellar Matter”,School of Physics and Optoelectronic Engineering,Xiangtan University,Xiangtan Hunan411105;Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi Xinjiang 830011;State Key Laboratory of Radio Astronomy and Technology,Beijing 100101;Xinjiang Key Laboratory of Radio Astrophysics,Urumqi Xinjiang 830011;University of Chinese Academy of Sciences,Beijing 100049)
出处
《首都师范大学学报(自然科学版)》
2026年第1期44-55,共12页
Journal of Capital Normal University:Natural Science Edition
基金
新疆维吾尔自治区自然科学基金项目(2022D01E085)
新疆维吾尔自治区天山英才培养计划项目(2023TSYCCX0105)
西部之光-西部交叉团队重点实验室专项项目(xbzg-zdsys-202320)
中国科学院科研仪器设备研制项目(PTYQ2022YZZD01)
新疆维吾尔自治区重大科技专项项目(2022A03013-3)。
